They are very similar devices in many ways. Both are solidly built and robust; the PB has a clip-on cover, which is very nice; the Opus comes in a very sturdy pouch. Both have support for microSDHC cards and can store essentially unlimited numbers of books in a full folder-based file system.
The real difference is in the firmware. The Opus is basically a dedicated ePub (or Mobipocket - you can choose which firmware to install) device, while the PB can read a range of different formats. ePub support is definitely better on the Opus at present, but the ePub firmware is very new on the PB and will doubtless improve over time. The PB can search books (the Opus can't) and also has a number of other applications on it (various games, a clock, a calendar, etc).
You really can't go wrong with either. At the moment, it's a close call, but I'd say that the Pocketbook is the better device overall, due to its flexibility, but the Opus has the edge if all you want to do is read ePub books.
Hope that's of some help.
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